nonstress test

nonstress test

(NST) [non-stres´]

evaluation of fetal well being during the intrauterine period. Observations of fetal heart rate response to fetal movements are made: a reactive pattern of more than 15 beats per minute above the baseline heart rate twice in 10 minutes is indicative of well being; a nonreactive pattern may indicate asphyxia, maternal medication, fetal anomalies, or a prolonged rest state. See also fetal monitoring.

nonstress test

An ultrasound examination of a fetus that measures fetal well-being by correlating fetal movement with changes in fetal heartbeat.

nonstress test (NST)

[non′stres]

an evaluation of the fetal heart rate response to natural contractile activity or to an increase in fetal activity. Also called fetal activity determination.

nonstress test

Obstetrics An indirect non-invasive monitor of the well-being of a fetus, where the frequency of fetal movement, degree of heart rate acceleration and beat-to-beat variation of the heart rate are monitored to determine the 'health' of the placental vasculature. See Deceleration, Montevideo units. Cf Fetal heart monitoring, Stress test.

2] gel, six underwent oxytocin induction: four with prolonged rupture of membranes ([is greater than] 24 hours), one who had a Bishop score of 6 and pregnancy-induced hypertension, and one who was transferred to the university hospital because of a nonreactive nonstress test before the planned outpatient insertion of gel.

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